<template>
  <div>
    <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>分类参数</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片视图区域 -->
    <el-card>
      <!-- 警告提示区域 -->
      <el-alert show-icon
        title="注意：只允许为第三级分类设置相关参数！"
        type="warning" :closable="false">
      </el-alert>
      <!-- 选择商品的分类区域 -->
      <el-row class="cat_opt">
        <el-col>
          <span>选择商品分类：</span>
          <!-- 选择商品分类的级联 -->
          <el-cascader
            v-model="selectedCateKeys"
            :options="cateList"
            :props="{
              expandTrigger:'hover',
              ...cateProps,
              checkStrictly:'true'}"
            @change="handleChange"
            clearable></el-cascader>
        </el-col>
      </el-row>
      <!-- tab页签区域 -->
      <el-tabs v-model="activeName" @tab-click="handleTabClick">
        <!-- 添加动态参数面板 -->
        <el-tab-pane label="动态参数" name="many">
          <!-- 添加参数的按钮 -->
          <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="showAddDialog">添加参数</el-button>
          <!-- 动态参数表格 -->
          <el-table :data="manyTableData" border stripe>
            <!-- 展开行 -->
            <el-table-column type="expand">
              <template slot-scope="scope">
                <!-- 循环渲染tag标签 -->
                <el-tag v-for="(item,i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i,scope.row)">{{item}}</el-tag>
                <!-- 输入文本框 -->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)">
                </el-input>
                <!-- 添加按钮 -->
                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
              </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column type="index"></el-table-column>
            <el-table-column label="参数名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <!-- 修改按钮 -->
                <el-button type="primary" icon="el-icon-edit" size="mini" @click="editShowDialog(scope.row.attr_id)">修改</el-button>
                <!-- 删除按钮 -->
                <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeParamsById(scope.row.attr_id)">删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
        <!-- 添加静态属性面板 -->
        <el-tab-pane label="静态属性" name="only">
          <!-- 添加属性的按钮 -->
          <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="showAddDialog">添加属性</el-button>
          <!-- 静态属性表格 -->
          <el-table :data="onlyTableData" border stripe>
            <!-- 展开行 -->
            <el-table-column type="expand">
              <template slot-scope="scope">
                <!-- 循环渲染tag标签 -->
                <el-tag v-for="(item,i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i,scope.row)">{{item}}</el-tag>
                <!-- 输入文本框 -->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)">
                </el-input>
                <!-- 添加按钮 -->
                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
              </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column type="index"></el-table-column>
            <el-table-column label="参数名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <!-- 修改按钮 -->
                <el-button type="primary" icon="el-icon-edit" size="mini" @click="editShowDialog(scope.row.attr_id)">修改</el-button>
                <!-- 删除按钮 -->
                <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeParamsById(scope.row.attr_id)">删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
      </el-tabs>
    </el-card>
    <!-- 添加动态参数对话框 -->
    <el-dialog
      :title="'添加' + titleText"
      :visible.sync="addParamsDialogVisible"
      width="50%"
      @close="addParamsDialogClosed">
      <!-- 内容主体区域 -->
      <el-form
      :model="addParamsForm"
      :rules="addParamsFormRules"
      ref="addParamsFormRef"
      label-width="100px">
        <el-form-item :label="labelText" prop="attr_name">
          <el-input v-model="addParamsForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <!-- 底部区域 -->
      <span slot="footer" class="dialog-footer">
        <el-button @click="addParamsDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addParams">确 定</el-button>
      </span>
    </el-dialog>
    <!-- 修改动态参数对话框 -->
    <el-dialog
      :title="'修改' + titleText"
      :visible.sync="setParamsDialogVisible"
      width="50%"
      @close="setParamsDialogClosed">
      <!-- 内容主体区域 -->
      <el-form
      :model="setParamsForm"
      :rules="setParamsFormRules"
      ref="setParamsFormRef"
      label-width="100px">
        <el-form-item :label="labelText" prop="attr_name">
          <el-input v-model="setParamsForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <!-- 底部区域 -->
      <span slot="footer" class="dialog-footer">
        <el-button @click="setParamsDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="setParams">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  data () {
    return {
      // 商品分类列表
      cateList: [],
      // 级联选择框的配置对象
      cateProps: {
        value: 'cat_id',
        label: 'cat_name',
        children: 'children'
      },
      // 级联选择框双向绑定到的数组
      selectedCateKeys: [],
      // 被激活的页签名称
      activeName: 'many',
      // 动态参数的数据
      manyTableData: [],
      // 静态属性的数据
      onlyTableData: [],
      // 添加动态参数对话框的显示和隐藏
      addParamsDialogVisible: false,
      // 添加参数表单的数据对象
      addParamsForm: {
        attr_name: ''
      },
      // 添加参数表单的数据对象的验证规则
      addParamsFormRules: {
        attr_name: [
          { required: true, message: '请输入参数名称', trigger: 'blur' }
        ]
      },
      // 修改对话框的显示和隐藏
      setParamsDialogVisible: false,
      // 修改参数表单的数据对象
      setParamsForm: {},
      // 修改参数表单的数据对象的验证规则
      setParamsFormRules: {
        attr_name: [
          { required: true, message: '请输入参数名称', trigger: 'blur' }
        ]
      },
      // 输入框文本
      inputValue: '',
      // 控制按钮与文本框的切换显示
      inputVisible: false
    }
  },
  created () {
    this.getCateList()
  },
  methods: {
    // 获取商品分类列表
    async getCateList () {
      const { data: res } = await this.$http.get('categories')
      if (res.meta.status !== 200) {
        return this.$message.error('获取商品分类失败')
      }
      this.cateList = res.data
    },
    // 级联选择框选中项变化，会触发这个函数
    handleChange () {
      this.getParamsData()
    },
    // 获取参数的列表数据
    async getParamsData () {
      // 证明选中的不是三级分类
      if (this.selectedCateKeys.length !== 3) {
        this.selectedCateKeys = []
        this.manyTableData = []
        this.onlyTableData = []
        return false
      }
      // 证明选中的是三级分类
      console.log(this.selectedCateKeys)
      // 根据所选分类的id，和当前所处的面板，获取对应的参数
      const { data: res } = await this.$http.get(`categories/${this.catId}/attributes`, { params: { sel: this.activeName } })
      if (res.meta.status !== 200) {
        return this.$message.error('获取分类参数失败')
      }

      res.data.forEach(item => {
        item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
        // 控制文本框的显示和隐藏
        item.inputVisible = false
        item.inputValue = ''
      })
      console.log(res.data)
      if (this.activeName === 'many') {
        this.manyTableData = res.data
      } else {
        this.onlyTableData = res.data
      }
    },
    // tab页签点击事件处理函数
    handleTabClick () {
      console.log(this.activeName)
      this.getParamsData()
    },
    // 点击添加参数按钮事件
    showAddDialog () {
      this.addParamsDialogVisible = true
    },
    // 监听添加参数对话框关闭事件
    addParamsDialogClosed () {
      this.$refs.addParamsFormRef.resetFields()
    },
    // 单击对话框确定事件添加参数
    addParams () {
      this.$refs.addParamsFormRef.validate(async valid => {
        if (!valid) return
        const { data: res } = await this.$http.post(`categories/${this.catId}/attributes`, {
          attr_name: this.addParamsForm.attr_name,
          attr_sel: this.activeName
        })
        if (res.meta.status !== 201) {
          return this.$message.error('添加分类参数列表失败')
        }
        this.$message.success('添加参数列表成功')
        this.addParamsDialogVisible = false
        this.getParamsData()
      })
    },
    // 监听修改参数对话框关闭事件
    setParamsDialogClosed () {
      this.$refs.setParamsFormRef.resetFields()
    },
    // 点击按钮展示修改对话框
    async editShowDialog (id) {
      const { data: res } = await this.$http.get(`categories/${this.catId}/attributes/${id}`, { params: { attr_sel: this.activeName } })
      if (res.meta.status !== 200) {
        return this.$message.error('获取参数名称失败')
      }
      // this.$message.success('修改参数名称成功')
      this.setParamsForm = res.data
      this.setParamsDialogVisible = true
    },
    // 点击修改对话框确定按钮
    setParams () {
      this.$refs.setParamsFormRef.validate(async valid => {
        if (!valid) return
        const { data: res } = await this.$http.put(`categories/${this.catId}/attributes/${this.setParamsForm.attr_id}`, {
          attr_name: this.setParamsForm.attr_name,
          attr_sel: this.activeName
        })
        if (res.meta.status !== 200) {
          return this.$message.error('修改参数名称失败')
        }
        this.$message.success('修改参数名称成功')
        this.setParamsDialogVisible = false
        this.getParamsData()
      })
    },
    // 删除按钮的点击事件
    async removeParamsById (id) {
      // 弹框询问用户是否删除数据
      const confirmResult = await this.$confirm('此操作将永久删除该文件, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).catch((err) => err)
      // console.log(confirmResult)
      if (confirmResult !== 'confirm') {
        return this.$message.info('已经取消了删除')
      }
      // 删除的业务逻辑
      const { data: res } = await this.$http.delete(`categories/${this.catId}/attributes/${id}`)
      if (res.meta.status !== 200) {
        return this.$message.error('删除参数失败!')
      }
      this.$message.success('删除参数成功!')
      this.getParamsData()
    },
    // 文本框失去焦点，或摁下了enter都会触发
    async handleInputConfirm (row) {
      if (row.inputValue.trim().length === 0) {
        row.inputValue = ''
        row.inputVisible = false
        return false
      }
      // 如果没有return，则证明输入的内容需要进行后续处理
      row.attr_vals.push(row.inputValue.trim())
      row.inputValue = ''
      row.inputVisible = false
      // 需要发起请求保存本次操作
      this.setAttrValues(row)
    },
    // 将对attr_vals的操作保存到数据库
    async setAttrValues (row) {
      // 需要发起请求保存本次操作
      const { data: res } = await this.$http.put(`categories/${this.catId}/attributes/${row.attr_id}`, {
        attr_name: row.attr_name,
        attr_sel: row.attr_sel,
        attr_vals: row.attr_vals.join(' ')
      })
      if (res.meta.status !== 200) {
        return this.$message.error('修改参数项失败')
      }
      this.$message.success('修改参数项成功')
    },
    // 点击按钮展示文本输入框
    showInput (row) {
      row.inputVisible = true
      // 让文本框自动获得焦点
      // $nextTick方法：当页面上的元素被重新渲染之后，才会指定回调函数中的代码
      this.$nextTick(_ => {
        this.$refs.saveTagInput.$refs.input.focus()
      })
    },
    // 删除标签参数项
    handleClose (i, row) {
      row.attr_vals.splice(i, 1)
      this.setAttrValues(row)
    }
  },
  computed: {
    // 如果按钮需要被禁用，则返回true，否则返回false
    isBtnDisabled () {
      if (this.selectedCateKeys.length !== 3) {
        return true
      }
      return false
    },
    // 当前选中的三级分类id
    catId () {
      if (this.selectedCateKeys.length === 3) {
        return this.selectedCateKeys[2]
      }
      return null
    },
    // 动态计算标题的文本
    titleText () {
      if (this.activeName === 'many') {
        return '动态参数'
      }
      return '静态属性'
    },
    // 动态计算label名称
    labelText () {
      if (this.activeName === 'many') {
        return '动态参数：'
      }
      return '静态属性：'
    }
  }
}
</script>

<style lang="less" scoped>
.cat_opt{
  margin: 15px 0px;
}
.el-tag{
  margin: 10px;
}
.input-new-tag {
  width: 90px;
  margin-left: 10px;
}
</style>
